Publication Date:
2020-12-07
Description:
Stromboli is a volcanic island that is part of the Aeolian arch in
the Mediterranean Sea (Italy). It is one of the most active volcanoes
in Europe. Its moderate, but persistent, explosive activity
makes it an ideal site for studies into the seismogenic processes
in volcanic areas (Auger et al. 2006; Chouet et al. 2003; Chouet
et al. 2008; D’Auria and Martini 2008; Del Pezzo et al. 1992;
Esposito et al. 2008; Jaupart and Vergniolle 1989; Martini et
al. 2007); it also attracts a lot of tourists. In the past, this combination
of tourism and volcanic activity was not considered
to be dangerous, but over the past few decades, Stromboli has
produced stronger explosions that have in some cases injured
people visiting the summit area. Moreover, in the recent history
of Stromboli, two effusive eruptions have occurred that
were accompanied by dangerous phenomena such as tsunami
and vulcanian explosions. The first of these effusive eruptions
(on 28 December 2002) produced a lava flow on the Sciara del
Fuoco side, which is the northwest flank of the island. Two
days later, a landslide occurred on this flank, which resulted in
the propagation of a 10-m tsunami wave around the coasts of
the island.
These events demonstrate that Stromboli can be dangerous,
even if its activity is not very energetic. Indeed, the Sciara
del Fuoco structure is a weakness zone of the volcanic edifice
that fractures when the explosive activity increases, giving rise
to this effusive activity (Martini et al. 2007). Moreover, during
the past two effusive eruptions, vulcanian explosions were associated
with the end stages of the effusive phases. These damaged
the village of Ginostra and caused fires in the vegetation.
For these reasons, in January 2003, the Istituto Nazionale di
Geofisica e Vulcanologia (INGV; the Italian National Institute
of Geophysics and Volcanology) started to install a broadband
seismic network that is designed to monitor Stromboli’s volcanic
activity. This nature of the activity requires broadband
instruments because the eruptive processes generate signals
that span a wide range of frequencies (Chouet et al. 2003;
Neuberg et al. 1994). At present, the typical seismic signals that
are being recorded on Stromboli are: volcanic tremors with frequencies
of 1–6 Hz; explosion quakes that include components
with different frequency contents, ranging from some tens of
seconds up to 10 Hz; long-period (LP) earthquakes with frequencies
of 1–6 Hz; volcano-tectonic (VT) earthquakes with
a frequency band of 1–20 Hz; and landslide signals with frequencies
of 1–10 Hz. In particular, very long period (VLP)
events with frequencies of 0.02–1 Hz are associated with the
Strombolian explosions and represent the lower frequency content
of the explosion quakes. Furthermore, the network records
regional and teleseismic events.
Description:
Published
Description:
435-439
Description:
1.4. TTC - Sorveglianza sismologica delle aree vulcaniche attive
Description:
JCR Journal
Description:
reserved
Keywords:
Broadband Seismic Network
;
Stromboli Volcano
;
04. Solid Earth::04.06. Seismology::04.06.10. Instruments and techniques
;
04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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